Documents from the anti-revisionist movement in India can be found in the Marxist Internet Archive section Marxism and Anti-Imperialism in India.
Groups covered there include the following:
Communist Party of India (Marxist) CPI(M)
Communist Party of India (Marxist-Leninist) CPI(ML)
Andhra Pradesh Coordination Committee of Communist Revolutionaries / APCCCR
Central Reorganisation Committee, Communist Party of India (Marxist-Leninist) / CRC CPI(ML)
Maoist Unity Centre, Communist Party of India (Marxist-Leninist) / MUC,CPI(ML)
Communist Party of India (Marxist-Leninist) (Naxalbari) / CPI(ML) (Naxalbari)
Communist Party of India (Marxist-Leninist) (People's War)
Communist Party of India (Maoist)
Maoist Communist Party of Manipur / MCP-M
Revolutionary Communist Party, India / RCPI
Revolutionary Socialist Party / RSP
Democratic Vanguard - Workers' Party of India / DV
Bolshevik Party of India / BPI
Revolutionary Communist Party of India / RCPI
Socialist Unity Centre of India (Communist)/ SUCI(C)
Also of value from an anti-revisionist perspective are many of the documents in the subsection devoted to the Communist Party of India relating to the internal struggles of that party in the 1960s.